Packaging device

ABSTRACT

Disclosed is a packaging device. Since a distance from a first top surface of a side plate to a surface of a bottom plate is greater than a distance from a second top surface to the surface of the bottom plate, that is, a top surface of the side plate of a box body is designed into an outer convex and inner concave structure, through subsequent reasonable design of sizes of the first top surface, the second top surface and a first slope surface and an angle of the first slope surface, when a box cover and the box body match, the box body and the box cover can match more closely.

This application claims priority to Chinese Patent Application No. 202120527364.0, filed on Mar. 12, 2021, which is hereby incorporated by reference in its entirety.

FIELD

The present disclosure relates to the field of packaging devices, in particular to a packaging device.

BACKGROUND

In the process of manufacturing a display panel, it is often necessary to transport the display panel from one place to another. In order to protect the display panel during transportation, the display panel is usually placed in a packaging device for the display panel.

SUMMARY

An embodiment of the present disclosure provides a packaging device, including a box body. The box body includes a bottom plate and a side plate fixed to a surface of the bottom plate. The bottom plate and the side plate jointly define an accommodating cavity. A top surface of the side plate includes: a first top surface at a first distance from the surface of the bottom plate, a second top surface at a second distance from the surface of the bottom plate, and a first slope surface connecting the first top surface and the second top surface; and the first distance is greater than the second distance, and the first top surface is located at an outermost side.

Optionally, in the packaging device provided by the embodiment of the present disclosure, an included angle between the first slope surface and the second top surface ranges from 100° to 110°.

Optionally, in the packaging device provided by the embodiment of the present disclosure, a width of the first top surface is greater than or equal to 10 mm, a width of the second top surface is greater than or equal to 10 mm, and a vertical distance between the first top surface and the second top surface is greater than or equal to 10 mm.

Optionally, the packaging device provided by the embodiment of the present disclosure further includes a plurality of stoppers located in the accommodating cavity, wherein the stoppers are embedded in an annular side edge.

Optionally, in the packaging device provided by the embodiment of the present disclosure, a height of a stopper is the same as or equal to the second distance.

Optionally, in the packaging device provided by the embodiment of the present disclosure, the box body is cubic, and the plurality of stoppers are respectively located at four corners of the box body.

Optionally, in the packaging device provided by the embodiment of the present disclosure, a shape of the top surface of the side plate matches a shape of a bottom surface of the side plate.

Optionally, the packaging device provided by the embodiment of the present disclosure further includes a box cover covering the box body, wherein the box cover includes: a first bottom surface in close contact with the first top surface, a second bottom surface in close contact with the second top surface, and a second slope surface connecting the first bottom surface and the second bottom surface; and a width of the first top surface is the same as or equal to a width of the first bottom surface.

Optionally, in the packaging device provided by the embodiment of the present disclosure, an included angle between the second slope surface and the second bottom surface ranges from 100° to 110°.

Optionally, in the packaging device provided by the embodiment of the present disclosure, there are a plurality of box bodies, the plurality of box bodies are stacked in sequence and match, and the box cover covers an uppermost box body.

Optionally, the packaging device provided by the embodiment of the present disclosure further includes a sealing member disposed on an outer side of the box body and the box cover.

Optionally, in the packaging device provided by the embodiment of the present disclosure, the sealing member is a plastic bag or an aluminum foil vacuum bag.

Optionally, the packaging device provided by the embodiment of the present disclosure further includes an aluminum foil cushion disposed at a bottom of the box body.

Optionally, in the packaging device provided by the embodiment of the present disclosure, the box body and the box cover are made of an expanded material.

Optionally, in the packaging device provided by the embodiment of the present disclosure, the expanded material includes expanded polystyrene or expanded polypropylene or expanded polyolefin composed of polyethylene and polystyrene.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a three-dimensional schematic diagram of a packaging device provided by an embodiment of the present disclosure.

FIG. 2 is a schematic sectional view in a direction AA′ in FIG. 1.

FIG. 3 is a schematic structural diagram of yet another packaging device provided by an embodiment of the present disclosure.

FIG. 4A is a partial schematic diagram of a packaging device in the related art.

FIG. 4B is another partial schematic diagram of a packaging device in the related art.

FIG. 5 is a schematic structural diagram of yet another packaging device provided by an embodiment of the present disclosure.

FIG. 6 is a schematic structural diagram of yet another packaging device provided by an embodiment of the present disclosure.

FIG. 7 is a schematic diagram of an airtightness test on a sealing member additionally disposed outside a packaging device provided by an embodiment of the present disclosure.

DETAILED DESCRIPTION OF THE EMBODIMENTS

In order to make the objects, technical solutions and advantages of an embodiment of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described with reference to the drawings of the embodiments of the present disclosure. It is obvious that the described embodiments are some, but not all embodiments of the present disclosure. In addition, the embodiments and the features in the embodiments of the present disclosure can be combined with each other without conflict. Based on the described embodiments of the present disclosure, all other embodiments obtained by a person skilled in the art without involving any inventive effort are within the scope of protection of the present disclosure.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which the present disclosure belongs. As used in the present disclosure, the terms “comprise” or “include”, and the like, means that an element or article which precedes the word, includes the element or article listed after the word and equivalents thereof, but does not exclude other elements or articles. The terms “connecting” or “connected”, and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms “inner”, “outer”, “upper”, “lower”, and the like, are used merely to denote a relative positional relationship that may change accordingly when the absolute position of the object being described changes.

It should be noted that the size and shape of the various figures in the drawings are not to scale and are intended to be merely illustrative of the present disclosure. The same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout.

An embodiment of the present disclosure provides a packaging device, and the packaging device includes a box body as shown in FIGS. 1 and 2. FIG. 1 is a three-dimensional schematic diagram of the box body. FIG. 2 is a schematic sectional view in the direction AA′ in FIG. 1. The box body includes a bottom plate 1 and a side plate 2 fixed to a surface of the bottom plate 1. The bottom plate 1 and the side plate 2 jointly define an accommodating cavity.

A top surface of the side plate 2 includes: a first top surface 21 at a first distance D1 from the surface of the bottom plate 1, a second top surface 22 at a second distance D2 from the surface of the bottom plate 1, and a first slope surface 23 connecting the first top surface 21 and the second top surface 22. FIG. 1 shows the first top surface 21 filled with diagonal lines, and the second top surface 22 filled with circles.

The first distance D1 is greater than the second distance D2, and the first top surface 21 is located at the outermost side.

There may be four side plates 2, and the side plates 2 are connected in sequence to form a frame shape, and the side plate 2 may also be ring-shaped. The packaging device provided by the embodiment of the present disclosure may be configured to package and transport various types of display panels, such as liquid crystal display (LCD) panels and organic light-emitting diode (OLED) display panels. In some embodiments, the packaging device provided by the embodiment of the present disclosure may also be configured to transport other products. Taking a liquid crystal display panel as an example, the liquid crystal display panel is placed in the accommodating cavity defined by the bottom plate and the side plates, and is prevented from moving through the accommodating cavity, so as to limit the liquid crystal display panel, thereby avoiding poor quality phenomena such as panel rupture and cracks during transportation.

In addition, in the packaging device provided by the embodiment of the present disclosure, since the distance from the first top surface to the surface of the bottom plate is greater than the distance from the second top surface to the surface of the bottom plate, that is, the top surface of the side plate of the box body is designed into an outer convex and inner concave structure, through the subsequent reasonable design of the sizes of the first top surface, the second top surface and the first slope surface and the angle of the first slope surface, when a box cover and the box body match, the box body and the box cover may match more closely, thereby improving the sealing effect of the packaging device, preventing moisture from entering the box body to corrode a product to be transported, preventing the product to be transported from being defective, and improving the quality of the product to be transported.

The embodiment of the present disclosure is described by taking the case where the packaging device is configured to transport the liquid crystal display panel as an example.

As shown in FIGS. 1 and 2, the accommodating cavity defined by the bottom plate 1 and the side plate 2 is illustrated as a rectangular accommodating cavity. In some embodiments, the accommodating cavity may also be in other shapes, such as square, circle, triangle or trapezoid, which is designed according to actual needs.

In some embodiments, in order to make the box cover described below and the box body seamlessly fit, in the packaging device provided by the embodiment of the present disclosure, as shown in FIG. 2, an included angle B between the first slope surface 23 and the second top surface 22 ranges from 100° to 110°, such as 100°, 110°, etc.

In some embodiments, in order to further make the box cover described below and the box body seamlessly fit, in the packaging device provided by the embodiment of the present disclosure, as shown in FIG. 2, a width d1 of the first top surface 21 is greater than or equal to 10 mm, a width d2 of the second top surface 22 is greater than or equal to 10 mm, and a vertical distance d3 between the first top surface 21 and the second top surface 22 is greater than or equal to 10 mm.

In some embodiments, the packaging device provided by the embodiment of the present disclosure, as shown in FIGS. 1 and 2, further includes a plurality of stoppers 3 located in the accommodating cavity. The stoppers 3 are embedded in an annular side edge 2. The stoppers 3 are fixed relative to the box body, and are configured to limit and fix the entire liquid crystal display panel to prevent the liquid crystal display panel from moving in the box body.

In some embodiments, in the packaging device provided by the embodiment of the present disclosure, as shown in FIGS. 1 and 2, the height of the stoppers 3 is the same as the second distance D2. In this way, on one hand, the box cover described below and the box body may fit more closely to further achieve seamless fit; and on the other hand, when a plurality of display panels are stacked in the box body, the uppermost display panel may be firmly fixed, and prevented from moving.

In some embodiments, in the packaging device provided by the embodiment of the present disclosure, as shown in FIGS. 1 and 2, the box body may be square, and the plurality of stoppers 3 are respectively located at four corners of the box body. As shown in FIG. 3, FIG. 3 is a structure where the liquid crystal display panel 4 is placed in FIG. 1, so that the stoppers 3 are fixed relative to the box body, and are configured to be attached to both sides of the corners of the liquid crystal display panel 4, so as to limit and fix the corners of the liquid crystal display panel 4, thereby realizing the limiting and fixing of the entire liquid crystal display panel 4 and preventing the liquid crystal display panel 4 from moving in the box body.

In some embodiments, the quantity of the stoppers 3 in the present disclosure is not limited to four, the position of the stoppers 3 is not limited to the corners of the box body, and the quantity and position of the stoppers 3 may be set according to actual needs.

In the related art, as shown in FIG. 4A, the side plate 02 (only part is shown) generally adopts a structure with an outer recess 021 and an inner protrusion 022. When the size of the liquid crystal display panel and the size of the stopper 03 are fixed, and the distance between the side plate 2 and the liquid crystal display panel is fixed, if the size of the stopper 03 is too large, the stopper 03 needs to penetrate the side plate 02 to enter the concave structure outside, so that the box cover and the box body may not fit seamlessly since the stopper 03 enters the outer recess 021. In the related art, in order to achieve seamless fit between the box cover and the box body, the size of the inner protrusion 022 needs to be set to be larger, as shown in FIG. 4B, which requires more materials to make the box body, thereby increasing costs.

As shown in FIGS. 1 and 2, the side plate 2 provided by the embodiment of the present disclosure adopts the outer convex and inner concave structure, so that when the size of the liquid crystal display panel and the size of the stoppers 3 are fixed, and the distance between the side plate 2 and the liquid crystal display panel is fixed, if the size of the stoppers 3 is too large, the stoppers 3 only need to be embedded in the side plate 2. Since the present disclosure has the outer convex and inner concave structure, the stoppers 3 may be embedded in the outer convex structure of the side plate 2, and there is no need to increase the size of the side plate 2. Thus, the structure of the present disclosure can reduce the costs compared with the related art.

In some embodiments, in the packaging device provided by the embodiment of the present disclosure, as shown in FIGS. 1 and 2, shapes of the top surfaces (21, 22, and 23) of the side plate 2 match shapes of bottom surfaces (24, 25 and 26) of the side plate 2. In this way, a plurality of box bodies may be stacked, and then one box cover may be used to seal the uppermost box body. Compared with fit of one box body and one box cover, the packaging device can save materials, reduce costs, and save occupied space of the packaging device.

In some embodiments, the packaging device provided by the embodiment of the present disclosure, as shown in FIG. 5, further includes the box cover 5 covering the box body. The box cover 5 includes a first bottom surface 51 in close contact with the first top surface 21, a second bottom surface 52 in close contact with the second top surface 22, and a second slope surface 53 connecting the first bottom surface 51 and the second bottom surface 52.

The width of the first top surface 21 is the same as the width of the first bottom surface 51, which is beneficial to realizing seamless and close contact between the box cover 5 and the box body, preventing moisture from entering the inside of the packaging device, and improving the quality of the display panel.

In some embodiments, in the packaging device provided by the embodiment of the present disclosure, as shown in FIG. 5, the included angle between the second slope surface 53 and the second bottom surface 52 ranges from 100° to 110°, such as 100°, 110°, etc., which may realize seamless and close contact between the box cover 5 and the box body, prevent moisture from entering the inside of the packaging device, and further improve the quality of the display panel.

In some embodiments, in the packaging device provided by the embodiment of the present disclosure, as shown in FIG. 6, a liquid crystal display panel 4 is placed in each box body, and there are a plurality of box bodies (taking three box bodies as an example), the plurality of box bodies are stacked in sequence and match, and the box cover 5 covers the uppermost box body, which can save materials, reduce costs, and save the space occupied by the packaging device. Specifically, the quantity of the box bodies is selected according to actual needs.

In some embodiments, as shown in FIG. 6, thicknesses of the accommodating cavities of the plurality of box bodies may all be the same, or different.

When a plurality of display panels are packaged through the packaging device provided by the embodiment of the present disclosure, the quantity of display panels that may be packaged may be determined according to the internal size of the packaging device, and then a flexible structure is disposed between every two adjacent display panels to prevent direct contact between the display panels. In addition, flexible structures may be disposed on the bottoms and tops of the plurality of display panels to prevent direct contact between the bottom display panel and the box body and direct contact between the top display panel and the box cover, thereby increasing buffer protection and reducing friction damage.

In some embodiments, in the packaging device provided by the embodiment of the present disclosure, in order to further prevent the product to be transported, such as the liquid crystal display panel, from being corroded by moisture, the packaging device may further include a sealing member arranged on the outer side of the box body and the box cover, and the sealing member seals the box body, the box cover and the liquid crystal display panel in the accommodating cavity together to form a whole, thereby further protecting the panel from being corroded by moisture during transportation.

In some embodiments, the product to be transported has a low or high or medium moisture requirement. The low moisture requirement means that a small amount of moisture entering the accommodating cavity will not affect the performance of the product to be transported, while the high moisture requirement means that a small amount of moisture entering the accommodating cavity will affect the performance of the product to be transported. Therefore, in the packaging device provided by the embodiment of the present disclosure, when the product to be transported has the low moisture requirement, the sealing member may be a plastic bag; and when the product to be transported has the high moisture requirement, the sealing member is preferably an aluminum foil vacuum bag. The aluminum foil vacuum bag is used to wrap the box body, the box cover and the liquid crystal display panel together, and then vacuumizing is conducted, thereby realizing the vacuum preservation of the product to be transported, and realizing the purpose of moisture protection.

In some embodiments, in the packaging device provided by the embodiment of the present disclosure, in order to further prevent the product to be transported, such as the liquid crystal display panel, from being corroded by moisture, the packaging device may also include an aluminum foil cushion disposed at the bottom of the box body. The aluminum foil cushion may also prevent moisture from entering the accommodating cavity. The aluminum foil cushion may be used when the product to be transported has a general moisture requirement.

In some embodiments, in the packaging device provided by the embodiment of the present disclosure, the box body and the box cover are preferably made of an expanded material. The expanded material is soft, and may play a buffering role when the box body and the box cover collide with external objects.

In some embodiments, in the packaging device provided by the embodiment of the present disclosure, the expanded material includes, but is not limited to, expanded polystyrene (EPS) or expanded polypropylene (EPP) or expanded polyolefin (EPO) composed of polyethylene and polystyrene. In some embodiments, EPO may be composed of 30% of polyethylene and 70% of polystyrene.

In some embodiments, EPS is made from raw materials that are pre-expanded, cured, shaped, dried, and cut. EPS may not only be made into foam products of different densities and shapes, but also produce foam plates of various thicknesses. EPS is widely used in construction, heat preservation, packaging, freezing, daily necessities, industrial casting and other fields, and may also be used in manufacturing of exhibition venues, merchandise cabinets, advertising signs and toys.

EPP is a highly crystalline polymer/gas composite with excellent performance. With its unique and superior performance, it has become the fastest growing environment-friendly new type of compression-resistant buffering and thermal insulation material.

EPO is a light high molecular polymer. It is foam plastic with a hard closed-cell structure formed by adding a foaming agent into polystyrene resin, and meanwhile, heating to soften the mixture to generate gas.

The sealing effect of the packaging device provided by the embodiment of the present disclosure as shown in FIG. 5 and the sealing effect of the packaging device in the related art as shown in FIG. 4A are tested as follows.

1. In order to ensure that the interior of the packaging device is dry, a drying agent, such as CaCl₂, may be placed inside the packaging device, and the airtightness of the packaging device of the present disclosure and the airtightness of the packaging device in the related art may be determined by comparing the initial mass of CaCl₂ with the mass of CaCl₂ after being placed in the packaging device for several days, as shown in Table 1 below.

As may be seen, in the embodiment of the present disclosure, the mass of the drying agent CaCl₂ is changed from 348.28 g (the initial mass) to 498.49 g (mass after 3 days), and the weight gain is 150.21 g, which is 44% of the initial mass. In the related art, the mass of the drying agent CaCl₂ is changed from 329.29 g (the initial mass) to 487.53 g (mass after 3 days), and the weight gain is 158.24 g, which is 48% of the initial mass. Therefore, the moisture absorption amount of the drying agent in the related art is greater than that of the drying agent in the present disclosure, that is, the airtightness of the packaging device of the present disclosure is better.

TABLE 1 Packaging Initial mass Mass after 3 Weight gain device Testing condition(s) of CaCl₂ days of CaCl₂ of CaCl₂ The present Drying a packaging 348.28 g 498.49 g 150.21 g disclosure device of 65 inches The related in advance 329.29 g 487.53 g 158.24 g art Testing environment: 60° C., 90% RH Testing time: 3 days

2. Eleven liquid crystal display panels and eight packets of 40 g CaCl₂ drying agent are placed in each of the packaging device in the present disclosure and the packaging device in the related art, and the testing conditions are shown in Table 2. After two cycles of testing, there are three poor liquid crystal display panels in the related art, while all the liquid crystal display panels in the present disclosure are OK; and after four cycles of testing, there are six poor liquid crystal display panels in the related art, while all the liquid crystal display panels in the present disclosure are OK. Therefore, the packaging device of the present disclosure has better airtightness.

TABLE 2 Packaging Testing Way(s) of device condition(s) packaging 2 cycles 4 cycles The present Drying packaging devices of eleven liquid crystal OK OK disclosure 65 inches in advance display panels/the Testing environment: 25° C., packaging device, 70% RH; 8 h/−30° C. eight packets of 0% RH; 16 h/40° C., 40 g CaCl₂ 90% RH; 12 h/60° C., 50% drying agent The related art RH; 8 h/25° C., 50% eleven liquid crystal protective protective RH Testing time: 2 h display panels/the films of three films of six packaging device, of the eleven of the eleven eight packets of liquid crystal liquid crystal 40 g CaCl₂ display panels display panels drying agent have bubbles have bubbles

3. Both the packaging device of the present disclosure and the packaging in the related art are placed in an environment with a temperature of 60° C. and a humidity of 90% RH for 450 h. As shown in Table 3 below, it may be seen that the humidity in the packaging device of the related art is 82.12% RH, while the humidity in the packaging device of the present disclosure is 70.42% RH. Therefore, the packaging device of the present disclosure has better airtightness.

TABLE 3 Packaging Testing device condition(s) Way(s) of packaging The present Drying packaging In the packaging disclosure devices of 43 device, the inches in advance; temperature: 60.36° C., and placing the the humidity: 70.421% RH The related art packaging devices In the packaging device, in the environment the temperature: 60.36° C., of 60° C. and 90% the humidity: 82.21% RH RH for 450 h

In summary, the airtightness of the packaging device provided by the embodiment of the present disclosure is better than the airtightness of the packaging device in the related art.

4. The airtightness of the structure of adding different sealing members outside the packaging device is tested, as shown in FIG. 7, the ordinate on the left represents the temperature, the abscissa represents the time, the ordinate on the right represents the humidity, A represents the humidity of adding the plastic bag (PE) outside the packaging device, B represents the humidity of adding a vacuum bag outside the packaging device, C represents the humidity of adding the aluminum foil vacuum bag outside the packaging device, and D represents the temperature. It may be seen that the humidity A>the humidity B>the humidity C, so the airtightness of the aluminum foil vacuum bag is the best, the airtightness of the plastic bag (PE) is poor, and the airtightness of the vacuum bag is lower than that of the aluminum foil vacuum bag and higher than that of the plastic bag (PE). Thus, the sealing member may be selected according to the moisture requirement of the product to be transported.

The packaging device provided by the embodiment of the present disclosure includes the box body. The box body includes the bottom plate and the side plate fixed to the surface of the bottom plate. The bottom plate and the side plate jointly define the accommodating cavity. The top surface of the side plate includes: the first top surface at the first distance from the surface of the bottom plate, the second top surface at the second distance from the surface of the bottom plate, and the first slope surface connecting the first top surface and the second top surface. The first distance is greater than the second distance, and the first top surface is located at the outermost side. Since the distance from the first top surface of the side plate to the surface of the bottom plate is greater than the distance from the second top surface to the surface of the bottom plate, that is, the top surface of the side plate of the box body is designed into the outer convex and inner concave structure, through subsequent reasonable design of the sizes of the first top surface, the second top surface and the first slope surface and the angle of the first slope surface, when the box cover and the box body match, the box body and the box cover can match more closely, thereby improving the sealing effect of the packaging device, preventing moisture from entering the box body to corrode the product to be transported, preventing the product to be transported from being defective, and improving the quality of the product to be transported.

Although preferred embodiments of the present disclosure have been described, additional variations and modifications of these embodiments will occur to those skilled in the art upon attaining the basic inventive concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments and all variations and modifications that fall within the scope of the present disclosure.

It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiment of the present disclosure without departing from the spirit or scope of the embodiments of the present disclosure. Thus, it is intended that the present disclosure cover the modifications and variations of the embodiment provided they come within the scope of the appended claims and their equivalents. 

What is claimed is:
 1. A packaging device, comprising: a box body comprising a bottom plate and a side plate fixed to a surface of the bottom plate, wherein the bottom plate and the side plate jointly define an accommodating cavity; wherein a top surface of the side plate comprises: a first top surface at a first distance from the surface of the bottom plate, a second top surface at a second distance from the surface of the bottom plate, and a first slope surface connecting the first top surface and the second top surface; and the first distance is greater than the second distance, and the first top surface is located at an outermost side.
 2. The packaging device according to claim 1, wherein an included angle between the first slope surface and the second top surface ranges from 100° to 110°.
 3. The packaging device according to claim 1, wherein a width of the first top surface is greater than or equal to 10 mm, a width of the second top surface is greater than or equal to 10 mm, and a vertical distance between the first top surface and the second top surface is greater than or equal to 10 mm.
 4. The packaging device according to claim 1, further comprising a plurality of stoppers located in the accommodating cavity, wherein the stoppers are embedded in an annular side edge.
 5. The packaging device according to claim 4, wherein a height of a stopper is equal to the second distance.
 6. The packaging device according to claim 4, wherein the box body is cubic, and the plurality of stoppers are respectively located at four corners of the box body.
 7. The packaging device according to claim 1, wherein a shape of the top surface of the side plate matches a shape of a bottom surface of the side plate.
 8. The packaging device according to claim 7, further comprising a box cover covering the box body, wherein the box cover comprises: a first bottom surface in close contact with the first top surface, a second bottom surface in close contact with the second top surface, and a second slope surface connecting the first bottom surface and the second bottom surface; and a width of the first top surface is equal to a width of the first bottom surface.
 9. The packaging device according to claim 8, wherein an included angle between a second slope surface and a second bottom surface ranges from 100° to 110°.
 10. The packaging device according to claim 9, wherein a plurality of box bodies are disposed, the plurality of box bodies are stacked in sequence and match, and the box cover covers an uppermost box body.
 11. The packaging device according to claim 8, further comprising a sealing member disposed on an outer side of the box body and the box cover.
 12. The packaging device according to claim 11, wherein the sealing member is a plastic bag or an aluminum foil vacuum bag.
 13. The packaging device according to claim 8, further comprising an aluminum foil cushion disposed at a bottom of the box body.
 14. The packaging device according to claim 8, wherein the box body and the box cover are made of an expanded material.
 15. The packaging device according to claim 14, wherein the expanded material comprises expanded polystyrene or expanded polypropylene or expanded polyolefin composed of polyethylene and polystyrene.
 16. The packaging device according to claim 2, wherein a shape of the top surface of the side plate matches a shape of a bottom surface of the side plate.
 17. The packaging device according to claim 9, further comprising a sealing member disposed on an outer side of the box body and the box cover.
 18. The packaging device according to claim 10, further comprising a sealing member disposed on an outer side of the box body and the box cover.
 19. The packaging device according to claim 9, further comprising an aluminum foil cushion disposed at a bottom of the box body.
 20. The packaging device according to claim 10, further comprising an aluminum foil cushion disposed at a bottom of the box body. 